package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * @Author FengHuan Wang
 * @Date 2024/12/29 13:52
 * @Version 1.0
 */

//自定义切面，实现公共字段填充处理逻辑
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /*切入点*/
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
    /*前置通知，在通知中对公共字段尽心赋值*/
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的自动填充");

        /*开始获取切入点方法的签名对象*/
        //方法签名对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获取到当前拦截的方法上的数据库操作类型,采用注解的方式
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获取数据库操作类型
        OperationType operationType = autoFill.value();
        //获取到当前呗拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        Object entity = args[0];
        if (args == null || args.length == 0){
            return;
        }
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT ){
            //为两个公共字段赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性赋值
                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE){
            //当数据库操作类型为更新的时候
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
